Improvement in steam-cocks



G. H. CROSBY. Steam-Cock.

Patented Oct. 15. 1878.

77 z'ne use tr.

Z ad arm.

UNITED STATES PATENT OFFICE.

GEORGE II. CROSBY, OF EAST SOMERVILIJE, MASSACHUSETTS:

llVl PROVEM ENT IN STEAM-COCKS.

Specification finlning part of Letters Patent No. 208,961, dated October15, 1878; application filed March 8, 1878.

" and State of Massachusetts, have invented a new and useful AutomaticDifferential Steam- Oock; and do hereby declare the same to be describedin the following specification and represented in the accompanyingdrawings, of

which- Figure 1 is a side elevation, and Fig. 2 a vertical andlongitudinal section, of it.

The article in question, in common parlance, may be termed aself-regulating balancevalve, its purpose bcin g to enable steam to beextracted from a boiler or receiver and delivered at a constant or gss,entially uniform pressure at any desirable degree less thamofthe steamin such boiler or receiver.

My invention consists in the combination of a balanced valve and aspring and screw with the case, as described, provided with a passageleading out of the lower part of such case, and being for the escape ofsteam that may get into the part of the case in which the spring isplaced.

By means of the screw the spring may be compressed so as I to exert 011the balanced valve the degree of force that may be necessary to causethe steam discharged to have the required reduced pressure.

In the drawing, B denotes a cylindrical case, open at its inner end andprovided with an inlet, M, arranged as represented. The case is extendedwithin and screwed into a head, A, provided with a receiving anddischarging chamber, N, arranged at the open inner end of the case B.The said head A is furnished or constructed with an induct, H, and aneduct, I, disposed in line or ranging with each other and the inlet M,in manner as shown, there being a short passage or auxiliary educt, 0,leading from the chamber N into the educt I.

The induct H and cduct I, I usually construct or provide with femalescrews arranged in them or their outer ends, in manner as repre sentedat b and 0.

Vithin the case B is the balanced valve 0, which I generally providewith a stem, D, to extend into the bore 0 of a screw, F, which isscrewed through the closed end of the case B and against a disk, d,between which and the valve, and bearing against both, is a helicalspring, L, all being arranged as shown.

To. prevent steam that may leak past the valve into the spring-space ofthe case from impeding the correct action 'of the water and soiling thehandle of the screw, I provide the case and screw with a stuffing-box,c, and also -make in the lower partof the case a hole or passage, .00,the latter serving to allow the escape of the steam from the spring-chaniber or space, and thereby prevents it from exerting upwardpressure on the valve. l/Vithout the stuffing-box the steam that mightcondense in the spring-chamber would be'liable to flow out around thescrew and wet or soil its handle.

The balanced valve 0 has two heads, f y, of like diameter, and arrangedand connected by a stem, It, as represented. The upper head is recessed,as seen at 1', and has a series of holes, K K, extended laterallythrough it from its periphery to the recess. The valve is to fit to andslide endwise in the case B, the space between the heads of the valvecommunicating with the induct H by means of the inlet M. From such itwill be seen that when steam from a generator or vessel is receivedwithin the valve the pressure exerted against one is counterbalanced bythat against the other of its two heads. Under these circumstances, ifthe spring L be contracted by the screw F, the valve 0 will be movedmore or less into the chamber N, so as to cause steam to be dischargedthrough the passages K into such chamber. As soon as the steam thusreceived in the chamberN may attain a press ure beyond the force exertedagainst the valve by the spring IJ, the val ve will be forced backagainst the spring, and the steam will be shut ott from entering thechamber.

From this it will be seen that the pressure of the steam received intoand discharged from the chamber N may be regulated by means of the screwF and the spring-L. If a pressure-gage be applied to the chamber N, itwill be an easy matter to ascertain when the steam received within anddischarged from such chamber may be of the required tension or of apressure sufficiently less than that of the steam received into thebalanced valve.

The case B, open at its inner end and provided with the inlet M and.waste-steam escapeoutlet an, arranged substantially as described, incombination with the chamber N, balanced valve 6, spring L, and screw F,applied to such case, as set forth.

GEO. H. CROSBY.

\Vitnesses:

R. H. EDDY, JOHN R. Snow.

